1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Skb ref helpers. 4 * 5 */ 6 7 #ifndef _LINUX_SKBUFF_REF_H 8 #define _LINUX_SKBUFF_REF_H 9 10 #include <linux/skbuff.h> 11 12 /** 13 * __skb_frag_ref - take an addition reference on a paged fragment. 14 * @frag: the paged fragment 15 * 16 * Takes an additional reference on the paged fragment @frag. 17 */ 18 static inline void __skb_frag_ref(skb_frag_t *frag) 19 { 20 get_page(skb_frag_page(frag)); 21 } 22 23 /** 24 * skb_frag_ref - take an addition reference on a paged fragment of an skb. 25 * @skb: the buffer 26 * @f: the fragment offset. 27 * 28 * Takes an additional reference on the @f'th paged fragment of @skb. 29 */ 30 static inline void skb_frag_ref(struct sk_buff *skb, int f) 31 { 32 __skb_frag_ref(&skb_shinfo(skb)->frags[f]); 33 } 34 35 bool napi_pp_put_page(netmem_ref netmem); 36 37 static inline void 38 skb_page_unref(struct page *page, bool recycle) 39 { 40 #ifdef CONFIG_PAGE_POOL 41 if (recycle && napi_pp_put_page(page_to_netmem(page))) 42 return; 43 #endif 44 put_page(page); 45 } 46 47 /** 48 * __skb_frag_unref - release a reference on a paged fragment. 49 * @frag: the paged fragment 50 * @recycle: recycle the page if allocated via page_pool 51 * 52 * Releases a reference on the paged fragment @frag 53 * or recycles the page via the page_pool API. 54 */ 55 static inline void __skb_frag_unref(skb_frag_t *frag, bool recycle) 56 { 57 skb_page_unref(skb_frag_page(frag), recycle); 58 } 59 60 /** 61 * skb_frag_unref - release a reference on a paged fragment of an skb. 62 * @skb: the buffer 63 * @f: the fragment offset 64 * 65 * Releases a reference on the @f'th paged fragment of @skb. 66 */ 67 static inline void skb_frag_unref(struct sk_buff *skb, int f) 68 { 69 struct skb_shared_info *shinfo = skb_shinfo(skb); 70 71 if (!skb_zcopy_managed(skb)) 72 __skb_frag_unref(&shinfo->frags[f], skb->pp_recycle); 73 } 74 75 #endif /* _LINUX_SKBUFF_REF_H */ 76